Warning: number of items to replace is not a multiple of replacement length

I feel like a complete dolt, as I know this question has been asked by 
others on a fairly regular basis, but I'm going in circles trying to get 
the following to work:

id.prob<-function (tt)
{
library(mvtnorm)
#============================
Makeham<-function(tt)
{
a2=0.030386513
a3=0.006688287
b3=0.039047537
t<-tt-20
h.t<-a2+a3*exp(b3*t)
S.t<-exp(-a2*t+a3/b3*(1-exp(b3*t)))
return(S.t*h.t)
}
#===========================
trans<-function (age)
{
indic=c(2,2)
lage=log(age)
xpars=c(2.1862908,7.5528077,8.5806697,2.3319461,8.8959507,9.1380187,0.3720293) 

beta<-c(0,0)
alpha1<-c(0,0)
alpha2<-c(0,0)
beta[1]<-xpars[1]
alpha1[1]<-xpars[2]
alpha2[1]<-xpars[3]
beta[2]<-xpars[4]
alpha1[2]<-xpars[5]
alpha2[2]<-xpars[6]
corr<-matrix(rep(0,4),nc=2)
corr[1,1]=1
corr[2,2]=1
corr[1,2]=xpars[7]
corr[2,1]=corr[1,2]

LLK<-0
L<-c(0,0)
R<-c(0,0)

for(j in 1:2){
  if(indic[j]==1){
    L[j]<--Inf
    R[j]<-alpha1[j]-beta[j]*lage}
  if(indic[j]==2){
    L[j]<-alpha1[j]-beta[j]*lage
    R[j]<-alpha2[j]-beta[j]*lage}
  if(indic[j]==3){
    L[j]<-alpha2[j]-beta[j]*lage
    R[j]<-Inf}
}

  LLK<-pmvnorm(lower=L,upper=R,corr=corr)[1]

return(LLK)
}

#===========================

tot<-Makeham(tt)*trans(tt)
return(tot)
}

And then:

 > id.prob(20)
[1] 0.0001417763
 > id.prob(21)
[1] 0.00018078
 > id.prob(20:21)
[1] 0.0001417763 0.0001375794
Warning messages:
1: number of items to replace is not a multiple of replacement length
2: number of items to replace is not a multiple of replacement length
3: number of items to replace is not a multiple of replacement length
4: number of items to replace is not a multiple of replacement length
Please read some introductory literature regarding the S / R language!
Your code is not vectorizable at all.

In
   tot <- Makeham(tt)*trans(tt)

Makeham has length 2 and works (I guess), but in  trans(tt) you have

   lage=log(age)

which has length 2, but you get also length 2 in

   R[j]<-alpha1[j]-beta[j]*lage}

but assign it to a scalar value.
Ultimately I need to be able to integrate this function, which isn't 
going to happen (correctly) if I've messed-up writing the function.  
Thanks for any advice on this.

Regards,
Lyle W. Konigsberg
Professor of Anthropology
University of Tennessee
Knoxville, TN
LyleK at utk.edu

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Warning: number of items to replace is not a multiple of replacement length

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